The haunting sound of a 275-pound murder suspect breaking into tears and sobbing like a baby filled a Brooklyn courtroom yesterday as prosecutors played the taped confession of accused killer Lamar Means.

Means – charged with shooting 18-year-old Gary Wong to death during a botched robbery last year – could be heard crying and stammering as he slowly described how his ill-conceived plan to take Wong’s wallet went horribly wrong.

“I am sorry, I didn’t mean to do it,” Means could be heard saying on the tape, which was recorded at his hospital bed a day after the shooting.

“It wasn’t supposed to happen like this,” he said, his voice cracking as light sobs turned into a wail that made jurors visibly upset. “He grabbed the gun. We tussled for it. The gun was pointed at his stomach and then it went off. I didn’t mean to do it.”

The hulking Means hung his head down to his chest as he sat in court and listened to the tape yesterday. He is facing life in prison on first-degree murder charges for allegedly shooting Wong on Jan. 9, 2000, on West 30th Street in Coney Island.

After the shooting, Means was taken to the hospital, where doctors treated him for two gunshot wounds he suffered when he tried to run from an off-duty cop who opened fire after witnessing the deadly robbery.

As he lay in bed recovering, Means initially cooked up a story for police in which he described the diminutive Wong, who weighed only about 135 pounds, as the aggressor who tried to rob him.

But only 45 minutes after the first tape was made, Means asked to give another statement. This time he told police that he indeed had the gun and tried to rob Wong.

“I told him to give me the money,” Means said.

He said he then pulled the gun from his waistband to threaten Wong, and the victim grabbed the weapon and struggled for it. He then said he pulled the trigger so that Wong wouldn’t get the upper hand, and hit him once in the stomach.

That story didn’t match the testimony of Officer Anthony McLane, who witnessed the shooting and opened fire at Means. The officer said he saw Means point the gun while standing several feet from Wong, as the victim waved his arms for mercy.